Method for crowd and riot control

Abstract

An improved riot and crowd control interdiction method involves forming, in a defined location, a foam barrier which effectively inhibits passage through the barrier. Other anti-personnel devices may be placed and obscured by the foam barrier. Various barriers and methods to form a contained interdiction foam barrier are disclosed.

What is claimed is: 
     
       1. A method of riot and crowd control to interdict rioters and the like comprising the steps of: providing a barrier structure at a desired location to form an area through which passage by the rioters or crowd is to be denied,   the step of providing said barrier structure including positioning at least one collapsible chute member to form at least one portion of said barrier structure,   said chute member being sealed at one end thereof and including an opening at the other end thereof,   generating a high expansion foam and filling said collapsible chute member by flow of said generated foam through said opening to form a foam filled chute barrier element of a predetermined height thereby providing at least one portion of the barrier structure, and   directing said high expansion foam into the area on one side of said chute barrier to fill the area defined by said barrier structure with said high expansion foam to form a foamed area thereby to prevent passage through said foamed area and the foam filled chute barrier element.   
     
     
       2. The method as set forth in claim 1 wherein said chute member is of a predetermined geometrical cross-sectional shape. 
     
     
       3. The method as set forth in claim 2 wherein said chute member is circular in cross-sectional shape to form a cylindrical tubular barrier element. 
     
     
       4. The method as set forth in claim 2 wherein the step of providing a barrier structure includes the additional step of providing an additional barrier element to form another portion of said barrier structure. 
     
     
       5. The method as set forth in claim 4 wherein said additional barrier element is also a chute member which is filled with said high expansion foam. 
     
     
       6. The method as set forth in claim 4 wherein said additional barrier element is formed of sheet material, and wherein the step of providing said additional barrier element includes the step of supporting said sheet material in a vertical orientation. 
     
     
       7. The method as set forth in any one of claims 1, 2, 3 and 5 wherein said chute member includes at least one opening between the ends thereof, and wherein at least a portion of the foam used to fill the chute member flows through the opening in order to fill at least a portion of the area defined by said barrier structure. 
     
     
       8. The method as set forth in claim 1 wherein said barrier structure includes a plurality of chute elements arranged in spaced relation to form an enclosed area, and wherein said step of filling said chute member with foam includes filling each of said chute members with foam.